Jeff's roof is three times larger than Monica's roof. What is the measurement of the side where there is a question mark in the picture below? A. 8.1 ft
B. 8.3 ft
C. 8.7 ft
D. 12.5 ft

The random variable x has probability density function f (x) = k(−x²+5x−4) 1 ≤ x ≤ 4 or =0 1 show that k = 2/9 find 2 e(x), 3 the mode of x, 4 the cumulative distribution function f(x) for all x. 5 evaluate p(x ≤ 2.5). 6 deduce the value of the median and comment on the shape of the distribution.